Rebreathing-bag for anesthetizing apparatus.



E. I. MGKESSON- REBREATHING BAG FOR ANESTHETIZING APPARATUS. APPLIOATION FILED MAY 1, 1911.

Patented June 4, 1912.

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cgLuMBIA PLANOGRAPH FLO-,WASHINOTDN. D. C.

Nirn 'sra'rns ELMER I. MCKESSON, OF TOLEDO, OHIO.

REBREATHING-']3.AG FOR ANESTHETIZING APPARATUS.

Application filed May 1, 1911. Serial No. 624,486.

To all whom it may concern:

Be it known that I, ELMER I. MoKEssoN, a citizen of the United States, and a resident of Toledo, in the county of Lucas and State of Ohio, have invented a certain new and useful Reloreathing-Bag for Anesthetizing Apparatus; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

My invention relates to anesthetizing apparatus, and has particular reference to rebreathing bags for such apparatus.

In the use of the class of anesthetizing apparatus shown and described in my former application Serial No. 594,559, filed Nov. 28,

1910, it is important that the rebreathing bag thereof have a capacity which is preferably suitable for receiving only that por tion of the exhaled gas which was contained in the nose, pharynx, larynx, trachea, and bronchi and is still rich in anesthetizing properties, while the rest of the exhaled gas which was contained in the alveoli and bronchioles, and therefore richer in carbon dioxid and other decomposition products, is expelled to the atmosphere.

The object of my invention is the provision of simple and eflicient means in association with a bag of this character for regulating the capacity of the bag to suit the requirements of different patients, thus obviating the necessity of having a supply of different bags for such purpose and saving the labor and time incident to a changing of the bags.

The invention is fully described in the following specification, and while, in its broader aspect, it is capable of embodiment in numerous forms, a preferred'embodiment thereof is illustrated in the accompanying drawing, which is a side elevation of the apparatus partly in central longitudinal section, with the flexible bag portion thereof shown in the position which it assumes when the gaseous fluid is entirely discharged therefrom.

Referring to the drawing, 1 designates a shell which is preferably of tubular form and has one end open and its opposite or closed end 2 shown as provided with amp- Specification of Letters Patent.

Patented June 4, 1912.

' ple 8, which is adapted to be threaded or otherwise suitably attached to the apparatus with which it is to be associated.

Mounted for longitudinal shifting movements upon the shell 1 is a ring or collar 5, which preferably has its lower end portion, or that which is disposed toward the open end of the shell, reduced, as at 6. A gasket 7 fits within an interior groove of the collar 5 to provide a close fit between the collar and shell. This gasket also tends to prevent a free movement of the collar upon the shell. A bag 8 of rubber or other pliable material capable of retaining gases under pressure is drawn over the open end of the shell 1', and its open end is clamped securely and closely around the reduced portion 6 of the collar 5 by a clamping collar 9 of any suitable form. The bag 8 is preferably of suitable size to receive the major portion of the shell 1 so that when the lower or open end of the shell is at the limit of its movement within the bag the collar 5 is at or near the top of the shell. The capacity of the bag 8 is measured by the space between the lower end of the shell 1 and the bottom of the bag, and this may be reduced to substantially nothing or enlarged to a desired extent within the limit of the sizes of the shell and bag, by an inward or outward movement of the shell within the collar 5 and bag, as is apparent, To facilitate an adjustment of the parts to provide a bag of predetermined capacity the shell 1 is preferably provided at some point on its exterior with a longitudinally extending series of graduations designating cubic centimeters with which the upper edge of the collar 5 may register to indicate the capacity of the bag for any position of the collar upon the shell.

The bag 8 is confined within a casing 10, which is preferably formed of wire screen or other suitable perforate material of a stiff nature which permits the free passage of atmospheric air therethrough to exert itself upon the exterior of the bag 8. The casing 10 is substantially the shape of the portion of the shell 1 which it incloses except that it is slightly larger than'th'e shell so as not to bind the bag to the shell, and has its upper or inner end secured to the clamping collar 9, as at 11, or otherwise suitably attached to the collar 5 to have movements-therewith. The casing 10, in addition to serving as a protecting member for the bag 8, also serves to prevent an expansion'of said bag beyond the confines of the casing should the bag be of an expansible nature.

In order to prevent the lower portion of the bag from being drawn within the shell 1 when the air or gaseous matter is exhausted therefrom, the inner open end of the shell is covered with a screen or other suitable perforate member 12, which is adapted to permit the free passage of air therethrough into or from the bag. hen the air or other fluid is exhausted from the bag 8 the lower portion of such bag is drawn closely to the screen 12 and assumes the position indicated in the drawing.

In adjusting the apparatus to suit the capacity of the lungs of a patient the collar 5, and attached parts are moved outwardly upon the shell 1 until the outer edge of the ring registers with the scale designation on the shell indicating the capacity desired. When the proper adjustment has been effected, the space between the screen 12 and the'lower end of the casing 10 represents the capacity of the bag.

It is evident that I have provided a simple and efl'icient rebreathing bag for use in connection with anesthetizing and similar instruments, and that it .is capable of being easily and quickly adjusted to suit the capacity of the lungs of a patient, whereby to receive that portion of the exhaled gases which are rich in anesthetizing properties, while the balance of the gases of exhalation which are .too heavily charged with carbon dioxid for rebreathing purposes are discharged to the atmosphere.

' I wish it understood that my invention is not limited to any specific construction or arrangement of the parts, except in so far as such limitations are specified in the claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is,

' 1. A rebreathing apparatus comprising a shell having a passage therethrough, and a bag of pliable material receiving a portion of said shell and mounted for adjustment thereon, and means for holding the bag and shell in relative adjustment.

2. A rebreathing apparatus comprising an impervious bag of pliable material, a member adjustably fitting within said bag to regulate the capacity thereof, said member having a passage therethrough to the exterior of the bag and having a perforate closure for the inner end of such passage.

3. A rebreathing apparatus comprising a bag of pliable material, a member adjustably fitting within said bag to regulate the capacity thereof, and a protecting case for the bag.

at. An article of the class described, comprising a shell, a collar mounted for longitudinal adjustment on said shell and having a close sliding fit therearound,and a bag of pliable materialreceiving an end of said shell and attached at its open end to said collar.

5. An article of the class described, comprising a shell, a collar mounted for longitudinal adjustment thereon, a bag of pliable material and a bag protecting case fitting one within the other and receiving an end of the shell with their open ends attached to said collar, said shell having a passage therethrough to the interior of the bag and a perforate closure for the inner end of said passage.

6. An article of the class described, comprising an impervious bag of pliable material and a shell having a close sliding fit within the mouth of the bag, the inner end of the shell being perforate to limit the col lapsing movements of the bag.

7. An article of the class described, comprising a pliable impervious bag, means manually adjustable within the bag for regulating its capacity and collapsing movements, and means protecting the bag and limiting the dilation thereof.

8. In an article of the class described, a pliable impervious bag,'and means limiting the expansion and contraction thereof and having parts which are relatively adjustable to regulate the capacity of the bag.

9.In an article of the class described, a pliable impervious bag, and means limiting the expansion and contraction thereof and having two frictionally coa'ctingparts which are relatively adjustable to regulate the capacity of the bag.

10. In combination a shell having one end in communication with a source of gas supply and its other end provided with a perforate diaphragm, a collar mounted for longitudinal adjustment on said shell and having a close fit therearound, a bag of pliable material receiving the perforate end of the shell and attached at its open end to said collar, and a cage attached to said collar and inclosing the bag to permit a normal distention thereof and having its interior in communication with the atmosphere.

In testimony whereof, I have hereunto signed my name to this specification in the presence of' two subscribing witnesses.

' 'ELMER'I. MCKESSON.

Witnesses: r

' C. W. OWEN,

M Q. OPPENHEIM.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

.Washington, D. C. 

